The Marsh Fritillary, Euphydryas aurinia, is a butterfly of the Nymphalidae family.

A high concentration of colonies of three nationally scarce species, the Adonis Blue Polyommatus bellargus, Duke of Burgundy Hamearis lucina, and the largest population of Marsh Fritillary Euphydryas aurinia on the chalk, occur.

The former is the foodplant of the Marsh Fritillary, Euphydryas aurinia, and the Narrow-bordered Bee Hawk-moth, Hemaris tityus, while the latter is the food plant of the Pearl-bordered Fritillary, Boloria euphrosyne, and the Small Pearl-bordered Fritillary.